#include <stdio.h>
#include <math.h>


int main ()
{
	int n=0;
	int y=1;

	printf("请输入！\n");
	while(scanf("%d",&n)!=EOF)
	{
		
		printf("x=%d",y<<n);
		
		
		
		
	}
	
	
	
	printf("Hello!");
	return 0;
}
